#include <bits/stdc++.h>
#include "coins.h"
using namespace std;
vector<int> coin_flips(vector<int> b, int c) {
int ans = c;
for (int i = 0; i < b.size(); i++) {
if (b[i]) ans ^= i;
}
vector <int> temp; temp.emplace_back(ans);
return temp;
}
int find_coin(vector<int> b) {
int ans = 0;
for (int i = 0; i < b.size(); i++) if (b[i]) ans ^= i;
return ans;
}
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